52 research outputs found
Two Proton Emission with Electromagnetic Probes
A model to study two-proton emission from nuclei induced by electromagnetic
probes is developed. The process is due to one-body electromagnetic operators,
acting together with short-range correlations, and two-body currents.
The model includes all the diagrams containing a single correlation function.
The sensitivity of the cross section to the details of the correlation function
is studied by using realistic and schematic correlations. Results for the
O nucleus are presented.Comment: 9 pages, 8 figures, Contribution to the 6th. Workshop on
"Electromagnetic Induced Two-Hadron Emission",Pavia, 200
Photo-emission of two protons from nuclei
The photo-emission of two protons from the C, O and Ca
nuclei is investigated. Aim of the work is the study of the possibilities
offered by this probe to obtain information about the characteristics of the
short-range correlations. We have also evaluated the effects of the two-body
-currents which, in this processes, compete with those produced by the
short-range correlations. Our results show that (,pp) processes could
be more useful than (e,e'pp) for the study of the short-range correlations.Comment: 21 pages, 15 figures, 3 table
Una breve storia della radioterapia. A brief history of radiotherapy
Questo articolo delinea le pietre miliari dello sviluppo della radioterapia sin dai suoi inizi. In particolare, descrive come alcune delle differenti tecniche sviluppate e usate in più di 100 anni di storia sono diventate prassi comune: dalle molteplici applicazioni dei raggi X, utilizzati solo pochi mesi dopo la loro scoperta, che hanno definito l'inizio delle radiazioni ionizzanti nella terapia contro il cancro, fino alla più recente adroterapia. Sono citate le persone che hanno reso possibili questi sviluppi
Tensor and tensor-isospin terms in the effective Gogny interaction
We discuss the need of including tensor terms in the effective Gogny
interaction used in mean-field calculations. We show in one illustrative case
that, with the usual tensor term that is employed in the Skyrme interaction
(and that allows us to separate the like-nucleon and the neutron-proton tensor
contributions), we can describe the evolution of the N=28 neutron gap in
calcium isotopes. We propose to include a tensor and a tensor-isospin term in
finite-range interactions of Gogny type. The parameters of the two tensor terms
allow us to treat separately the like-nucleon and the neutron-proton
contributions. Two parameterizations of the tensor terms have been chosen to
reproduce different neutron single-particle properties in the 48Ca nucleus and
the energy of the first 0- state in the 16O nucleus. By employing these two
parameterizations we analyze the evolution of the N=14, 28, and 90 neutron
energy gaps in oxygen, calcium and tin isotopes, respectively. We show that the
combination of the parameters governing the like-nucleon contribution is
crucial to correctly reproduce the experimental (where available) or
shell-model trends for the evolution of the three neutron gaps under study.Comment: 20 pages, 6 figures. Accepted for publication in Physical Review
Effective tensor forces and neutron rich nuclei
We study the effects of the tensor term of the effective nucleon-nucleon
interaction on nuclear excited states. Our investigation has been conducted by
using a self-consistent Random Phase Approximation approach. We investigate
various nuclei in different regions of the isotopes chart. Results for a set of
calcium isotopes are shown.Comment: 4 pages, 4 figures, 1 table Proc. 10th International Spring Seminar
on Nuclear Physics New Quests in Nuclear Structure, Vietri Sul Mare, May
21-25, 201
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